### STATE OF MISSOURI

DEPARTMENT OF NATURAL RESOURCES

MISSOURI CLEAN WATER COMMISSION

MISSOURI STATE OPERATING PERMIT

In compliance with the Missouri Clean Water Law, (Chapter 644 R.S. Mo. as amended, hereinafter, the Law), and the Federal Water Pollution Control Act (Public Law 92-500, 92 nd Congress) as amended,

Permit No. MO-0098001

Owner: Ameren UE

Address: One Ameren Plaza, 1901 Chouteau Avenue, PO Box 66149, MC-602, St. Louis, MO 63166-6149

Continuing Authority: Same as above

Address: Same as above

Facility Name: Ameren UE, Callaway Power Plant

Address: PO Box 620, Fulton, MO 65251

Legal Description: See page 2

Receiving Stream: See page 2

First Classified Stream and ID: See page 2

USGS Basin & Sub-watershed No.: See page 2

is authorized to discharge from the facility described herein, in accordance with the effluent limitations and monitoring requi rements
as set forth herein:

FACILITY DESCRIPTION The Callaway Power Plant combined discharge line has a cumulative dai ly average flow of 5.64 MGD and a daily maximum flow of

14.4 MGD.

See next page for individual outfall descriptions

This perm it authorizes only wastewater di scharges under the Missouri Clean Water Law and the National Pollutant Discharge Elimination System; it does not apply to other regulated areas. This permit may be appealed in accordance with Section 644.051 .6 of

the Law.

February 13, 2009 April 14, 2010 Effective Date Revised Date Mark N. Temple ton, Director, Department of Natural Resources

February 12, 2014 Expiration Date Scott B. Tott en, Acting Director, Water Protection ProgramPage 2 of 21

Permit No. MO-0098001

FACILITY DESCRIPTION

Outfall #001 – Radwaste Treatment System - SIC #4911 (Piped to Missouri River)

This liquid radwaste system serves to coll ect, process, store, recycle and discharge treated waste water generated at Callaway. In addition, radioactive solids removed by this system are prepared for disposal and transported to a licensed off site disposal f acility. Five general sub-systems can be defined as described below.

The Boron Recycle System receives reactor c oolant for the purpose of recovering the bo ric acid for reuse in the plant. Boric a cid is used as a neutron absorber/moderator in the primary loop.

The Liquid Radwaste System coll ects and processes floor and equipment drains from the containment, auxiliary building, fuel building and radwaste buildings during normal operation.

The Laundry and Hot Shower system collects waste generated from washing radioactively contaminat ed protective gear and clothing and personnel decontamination shower wastew ater. These wastes are then transferred to the liquid Radwaste system for treatment

.

The Secondary Liquid Waste system is used to process condensate demineralizer regeneration wastes and potentially radioactive liquid waste collected from the turbine building. The condensate demineralizer regeneration waste is divided into two waste st reams; High TDS waste from the acid and caustic rinses used when chem ically regenerating spent resin, and low TDS waste which results from the initial backflushing of unregenerated resin and the fina l rinsing of the regenerated resin to remove acid and caustic.

Steam Generator Blowdown is normally recycled back to the main condenser for reuse in the secondary cycle. Provisions also exi st to discharge the treated blowdown via #001. The following wastewater treatment systems ar e used as required to treat this waste stream for recycle or discharge in complian ce with NRC requirements and are also available as auxiliary or backup treatment systems to treat this discharge for compliance with NP DES permit limitations: Evaporation and/or Mixing and/or Filtration and/or Carbon Absorpti on and/or Ion Exchange and/or Neutraliza tion and/or Reuse/Recycle of Treated Effluent. All processing in th e Radwaste Treatment System is done on a batch basis except stea m generator blowdown. After monitoring for radioactive content, release rates are controlled administratively to ensure the "as low as practicable" radioactive discharge criteria are met. Daily average flow is 0.027 MGD. Daily maximum flow is 0.298 MGD Legal Description: NE 1⁄4, NE 1⁄4, Sec. 14, T46N, R8W, Callaway Latitude/Longitude: +3845424/-09146462 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #002 - Cooling Tower Blowdown: (Piped to Missouri River) Daily average flow is 4.84 MGD. Daily maximum flow is 14.4 MGD. This outfall consists of water from the Circulating Water System , the Service Water System, and the Essential Service Water (ES W) System. Blowdown from the cooling tower is necessary to maintain the dissolved solids concentration in the recirculating water system within acceptable operatin g limits. The ESW System is not routinely us ed, however water from the ESW System does mix with the other systems as it is periodically run to demonstrat e operability. Additionally, the ESW System can be used to maint ain proper freeboard in the ultimate heat sink pond (see Outfall #017 description) by transferring water to the Service Water Syste m. Legal Description: NW 1⁄4, NW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845459/-09146388 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-280004)Page 3 of 21

Permit No. MO-0098001

Outfall #003 - Water Treatment Plant Wastes (Piped to Missouri River) Daily average flow is 0.0 MGD. Daily maximum flow is 1.645 MGD. (These flows represent wastewater discharged to the settling ba sin, actual discharge will vary depending on recycle.)Outfall #0 03 consists of supernatant from a wastewater tr eatment lagoon that treats wastewater to re move solids. The wastewater that is tre ated in the lagoon is mainly from the blowdown of accumulated river solid s in the water treatment plant clarifiers. The sand and carbo n filter backwash, oil water separator and demineralizer system wastewater is also routed to th is treatment lagoon. The oil water separ ator flow consists of wastewater from some plant sumps as well as flow from an oil recovery well that is being used to remediate a h istoric on-site release. Outfall #003 is normally recycled by routing it back to the head of the water treatment plant.

Legal Description: SW 1⁄4, SW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845065/-09146409 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #004 - Demineralizer System Wastes This discharge is now included under Outfall #003.

Outfall #007 – 3 Cell Flow Through Lagoon (Piped to Missouri River)

Daily average flow is 0.0 MGD. Daily Maximum flow is 0.040 MGD. Design Population Equivalent is 400. This outfall consists of a 3-cell lagoon designed to receive onl y sanitary, on-site cafeteria, an d laboratory waste from the pl ant. Sludge will be stored in the lagoon. The effluent will then be discharged to a constructed wetland. The monitoring location will be at the third treatment cell. Outfall #007 is normally recycled by routing it to the water treatment plant headworks. Legal Description: SW 1⁄4, SW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845123/-09146318 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #009 - Intake Heater Blowdown: (Located right on Missouri River) Daily average flow 0 MGD. Daily maximum flow is 0.006 MGD.

The river intake structure contains two r ecirculating electric heaters which are used to prevent ice formation on the intake ba r screens during the winter months. Outfall #009 consists of discharges from the infrequent blowdown or drainage of these boilers. Legal Description: NW 1⁄4, NW 1⁄4, Sec. 5, T45N, R7W, Callaway Latitude/Longitude: +3842127/-09144185 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfalls #010, #011, #012, #014 and #015 - Storm Water Runoff Average rainfall event is 0.7 MGD. Once in 10 year rainfall event is 38.5 MGD. These five outfalls discharge storm water runoff from plant and associated areas after treatmen t in settling ponds. "Non-proce ss" discharges that will be discharged to SWR include three intermi ttent sources. Two sources are the quarterly testing of the fir e protection drains and the infrequent draining of the demineralized water storage tank. The third source is the pumping of manh oles, transformer and tank containments at the plant. These outfa lls will be under a Storm Water Pollution Prevention Plan for this permit cycle, so no actual mon itoring will take place.Page 4 of 21

Permit No. MO-0098001

Outfall #010: Daily average flow is dependent on precipitation. Maximum daily flow is 4.6 MGD Legal Description: SW 1⁄4, SW 1⁄4, Sec. 12, T46N, R8W, Callaway Latitude/Longitude: +3846088/-09146261 Receiving Stream: Unnamed Tr ibutary to Logan Creek (U) First Classified Stream and ID: Logan Creek (C) (00704) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #011: Daily average flow is dependent on precipitation. Daily Maximum flow is 19.7 MGD Legal Description: NW 1⁄4, SE 1⁄4, Sec. 12, T46N, R8W, Callaway Latitude/Longitude: +3846105/-09146002 Receiving Stream: Unnamed Tr ibutary to Logan Creek (U) First Classified Stream and ID: Logan Creek (C) (00704) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #012: Daily average flow is dependent on precipitation. . Daily Maximum flow is 6.6 MGD Legal Description: NE 1⁄4, SE 1⁄4, Sec. 14, T46N, R8W, Callaway Latitude/Longitude: +3845168/-09146531 Receiving Stream: Tribut ary to Mud Creek (U) First Classified Stream and ID: Logan Creek (C) (00704) USGS Basin & Sub-watershed No.: (10300102-280004)

Outfall #013: terminated

Outfall #014: Daily average flow is dependent on precipitation. Daily Maximum flow is 4.8 MGD Legal Description: NW 1⁄4, SE 1⁄4, Sec. 11, T46N, R8W, Callaway Latitude/Longitude: +3846128/-09147052 Receiving Stream: Cow Branch (U) First Classified Stream and ID: Cow Creek (C) (00707) USGS Basin & Sub-watershed No.: (10300102-280003)

Outfall #015: Daily average flow is dependent on precipitation. Daily Maximum flow is 2.8 MGD Legal Description: SE 1⁄4, NE 1⁄4, Sec. 11, T46N, R8W, Callaway Latitude/Longitude: +3846232/-09146506 Receiving Stream: Cow Branch (U) First Classified Stream and ID: Cow Creek (C) (00707) USGS Basin & Sub-watershed No.: (10300102-280003)

Outfall #016 - Cooling Tower Bypass (Piped to Missouri River) Daily average flow is 0.777 MGD. Daily Maximum flow is 14.4 MGD.

This outfall consists of clarified river wate r and wastewater that has been recycled th rough the water treatment plant. It is used to moderate flow through the water treatment plant and to provide carrier water in the discharge line when discharging from Outfal l

#001. Legal Description: NW 1⁄4, NW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845328/-09146408 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri (P) (00701) USGS Basin & Sub-watershed No.: (10300102-280004)Page 5 of 21

Permit No. MO-0098001

Outfall #017 - Ultimate Heat Sink Daily average flow is 0 MGD. Daily Maximum flow is 0 MGD The Ultimate Heat Sink is a cooling pond that can provide cooling water to various plant systems during other than normal condi tions. Outfall #017 is the overflow from the Ultimate Heat Sink to local runoff. It is a no discharge outfall. Legal Description: SE 1⁄4, NE 1⁄4, Sec. 14, T46N, R8W, Callaway Latitude/Longitude: +3845363/-09146441 Receiving Stream: Unnamed Tr ibutary to Logan Creek (U) First Classified Stream and ID: Logan Creek (C) (00704) USGS Basin & Sub-watershed No.: (10300102-280004) This is a no-discharge outfall.P AGE NUMBER 6 of 21

A. EFFLUENT LIMITATIONS AND M ONITORING REQUIREMENTS PERMIT NUMBER MO-0098001 The permittee is authorized to discharge from outfall(s) with se rial number(s) as specified in the application for this permit. The final effluent limitations shall become effective upon issuance and re main in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING
OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS DAILY

MAXIMUM WEEKLY

AVERAGE MONTHLY

AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE

O utfall #001 - Radwaste System

Flow

Boron, Total Recoverable

Total Suspended Solids

Oil and Grease

Biochemical Oxygen Demand 5

pH – Units

Total Residual Chlorine

Temperature MGD

mg/L

mg/L

mg/L

mg/L

SU

mg/L

C *

*

45

20

*

**

0.2

* *

*

30

15

*

**

0.104

* once/daily each batch

each batch total

once/daily grab

each batch

once/daily grab

each batch

once/month grab

once/month grab

once/daily grab

each batch

once/month grab

once/month grab

MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY ; THE FIRST REPORT IS DUE April 28, 2009 . THERE SHALL

BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Acute Whole Effluent Toxicity (AWET) Test (Note 1) see special condition 12

MONITORING REPORTS SHALL BE SUBMITTED ONCE PER 5 YEARS ; THE FIRST REPORT IS DUE January 28, 2010 . THERE SHALL BE

NO DISCHARGE OF FLOATING SOLIDS OR VI SIBLE FOAM IN OTHER THAN TRACE AMOUNTS

B . STANDARD CONDITIONS

IN ADDITION TO SPECIFIED CONDITIONS STATED HE REIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III

STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994 , AND HEREBY INCORPORATED AS THOUGH

FULLY SET FORTH HEREIN.P AGE NUMBER 7 of 21

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-0098001 The permittee is authorized to discharge from outfall(s) with se rial number(s) as specified in the application for this permit. The final effluent limitations shall become effective upon issuance and re main in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING

OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS DAILY

MAXIMUM WEEKLY

AVERAGE MONTHLY

AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE

TYPE

O utfall #002 - Cooling Tower Blowdown

Flow

Total Suspended Solids

Total Dissolved Solids

Oil and Grease

Total Residual Chlorine

pH – Units

Temperature MGD

mg/L

mg/L

mg/L

mg/L

SU

C *

*

*

20

0.2

****

* *

*

*

15

0.104

****

* once/day 24 hr. total

once/week grab

once/week grab

once/quarter*** grab

once/day grab

continuous 24 hr.

recorded

once/day grab

MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY ; THE FIRST REPORT IS DUE April 28, 2009 . THERE SHALL

BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Acute Whole Effluent Toxicity (AWET) Test (Note 1) see special condition 12

MONITORING REPORTS SHALL BE SUBMITTED ANNUALLY ; THE FIRST RE PORT IS DUE January 28, 2010 . THERE

SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

Chronic Whole Effluent Toxicity (CWET) Test (Note 1) see special condition 13

MONITORING REPORTS SHALL BE SUBMITTED ONCE/ 5 YEARS ; THE FIRST REPORT IS DUE January 28, 2010 . THERE SHALL BE NO

DISCHARGE OF FLOATING SOLIDS OR VISI BLE FOAM IN OTHER THAN TRACE AMOUNTS.

B . STANDARD CONDITIONS

IN ADDITION TO SPECIFIED CONDITIONS STATED HE REIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III

STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994 , AND HEREBY INCORPORATED AS THOUGH

FULLY SET FORTH HEREIN.P AGE NUMBER 8 of 21
A. EFFLUENT LIMITATIONS AND M ONITORING REQUIREMENTS PERMIT NUMBER MO-0098001

The permittee is authorized to discharge from outfall(s) with se rial number(s) as specified in the application for this permit. The final effluent limitations shall become effective upon issuance and re main in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING RE Q UIREMENTS
OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS DAILY

MAXIMUM WEEKLY

AVERAGE MONTHLY

AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE

O utfall #003 - Water Treatment Plant

Flow

Total Suspended Solids

Oil and Grease

Total Residual Chlorine

p H - Units MGD

mg/L

mg/L

mg/L

SU *

100

20

0.2

** *

30

15

0.104

** once/week 24 hr. total

once/month grab

once/month grab

once/month grab

once/month grab

O utfall #004 - Demineralizer System (Now included under Outfall #003)

Outfall #007 - Sanitary Waste

Flow

Biochemical Oxygen Demand 5

Total Suspended Solids

pH – Units

Ammonia as N

Fecal Coliform

Oil and Grease MGD

mg/L

mg/L

SU

mg/L

cts/100mL

mg/L *

**

*

*

15 65

110 *

45

70

**

*

*

10 once/quarter*** 24 hr. estimate

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

Outfall #009 - Intake Heater Blowdown

Flow

Total Suspended Solids

Oil and Grease

p H - Units MGD

mg/L

mg/L

SU *

100

20

** *

30

15

** once/week when 24 hr. discharge occurs total

once/week when grab discharge occurs

once/week when grab discharge occurs once/week when grab discharge occurs

M ONITORING REPORTS SHALL BE SUBMITTED QUARTERLY ; THE FIRST REPORT IS DUE April 28, 2009

.

B. STANDARD CONDITIONS

IN ADDITION TO SPECIFIED CONDITIONS STATED HE REIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III

STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994 , AND HEREBY INCORPORATED AS THOUGH

FULLY SET FORTH HEREIN.PAGE NUMBER 9 of 21

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS PERMIT NUMBER MO-0098001

The permittee is authorized to discharge from outfall(s) with se rial number(s) as specified in the application for this permit. The final effluent limitations shall become effective upon issuance and re main in effect until expiration of the permit. Such discharges shall be controlled, limited and monitored by the permittee as specified below:

FINAL EFFLUENT LIMITATIONS MONITORING REQUIREMENTS

OUTFALL NUMBER AND EFFLUENT PARAMETER(S) UNITS DAILY

MAXIMUM WEEKLY

AVERAGE MONTHLY

AVERAGE MEASUREMENT SAMPLE FREQUENCY TYPE

O utfalls #010, #011, #012, #014 and #015 - Storm Water Runoff, and #017 ultimate heat sink note 2

See special condition # 9

MONITORING REPORTS SHALL NOT BE SU BMITTED. THERE SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR

VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS

O utfall #016 Cooling tower bypass

Flow

Total Suspended Solids

Oil and Grease

Total Residual Chlorine

pH – Units

Temperature MGD

mg/L

mg/L

mg/L

SU

C *

100

20

0.2

**

* *

30

15

0.104

**

* once/quarter*** 24 hr. estimate

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

once/quarter*** grab

MONITORING REPORTS SHALL BE SUBMITTED QUARTERLY ; THE FIRST REPORT IS DUE April 28, 2009 . THERE SHALL

BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS. Acute Whole Effluent Toxicity (AWET) Test (Note 1) see special condition 12

MONITORING REPORTS SHALL BE SUBMITTED ANNUALLY ; THE FIRST RE PORT IS DUE January 28, 2010 . THERE

SHALL BE NO DISCHARGE OF FLOATING SOLIDS OR VISIBLE FOAM IN OTHER THAN TRACE AMOUNTS.

IN ADDITION TO SPECIFIED CONDITIONS STATED HE REIN, THIS PERMIT IS SUBJECT TO THE ATTACHED Parts I & III

STANDARD CONDITIONS DATED October 1, 1980 and August 15, 1994 , AND HEREBY INCORPORATED AS THOUGH

FULLY SET FORTH HEREIN.

A. EFFLUENT LIMITATIONS AND MONITORING REQUIREMENTS (continued)

* Monitoring requirement only. ** pH is measured in pH units and is not to be averaged. The pH is limited to the range of 6.0-9.0 pH units. *** Sample once per quarter in the months of February, May, August, and November.   Permittee shall maintain the pH between 6.0 - 9.0 except excursions from the range are permitted subject to the followin g limitations: 1. The total time during which the pH values are outside the required range of pH values shall not exceed 7 hours and 26 minutes in any calendar month; and

2. No individual ex cursion from the range of pH values shall exceed 60 minutes. Monitoring reports shall show each excurs ion, the duration of the excursion, and the total excursion time for each month. Should the continuous monitor fail for any reason, daily grab samples shall be provided until repairs are completed. ** *** Discharge shall not cause temperatur e of the mixing zone to increase by more than 5 o FPage 10 of 21

Permit No. MO-0098001

Note 1 – WET Test must coincide with re sumption of discharge after a pplication of the treatment’s molluscicide and algaecide. Sample taken for WET Test should be representative of a mollusci cide and algaecide dosing event. If treatments are not used by December, use December as the sampling month.

Note 2-- Outfall #017 - Ultimate Heat Sink There shall be no discharge of wastewater from th is outfall to waters of the state of Missouri.

Note 3 -- The average of the temperatur e of outfall #002 will be used as the rive r discharge temperature for 316 (a) calculati ons.

C. SPECIAL CONDITIONS

1. In issuing this permit, the Missouri Clean Water Commission and the Missouri Department of Natural Resources has not determined whether or not the radioactive discharges from this pl ant will affect waters of the state. Radioactive discharges a re the responsibility of the Nuclear Regulatory Commission, and any discharges of these constituents will be under their regulation.

2. Discharge Limitations - There shall be no discharge of polychlorinated biphenyl compounds.

3. Pesticides Any pesticide discharge from any point source shall comply with the requirements of the Federal Insecticide, Fungicide, and Rodenticide Act, as amended (7W.S.C. 136 et. seq. ) and the use of such pesticides shall be in a manner consistent with its label.

4. This permit may be reopened and modified, or alternatively revoked and reissued, to: (a) Comply with any applicable effluent standard or limitation issued or approved under Sections 301(b)(2)(C) and (D), 304(b)(2), and 307(a) (2) of the Clean Water Act, if th e effluent standard or limitation so issued or approved: (1) contains different conditions or is otherwise more st ringent than any effluent limitation in the permit; or (2) controls any pollutant not limited in the permit. (b) Incorporate new or modified effluent limitations or other conditions, if the result of a waste load allocation study, toxicity test or other information indicates changes are necessary to assure compliance with Missouri’s Water Quality

Standards. (c) Incorporate new or modified effluent limitations or other conditions if, as the result of a watershed analysis, a Total Maximum Daily Load (TMDL) limitation is developed for the receiving waters which are currently included in Missouri’s list of waters of the state not fully achieving the state’s water quality standards, also called the 303(d) list. (d) Incorporate any items or limitations concerning section 316 (a) and 316(b) of the Clean Water Act.

The permit as modified or reissued under this paragraph shall also contain any other requirements of the Clean Water Act then applicable.

5. The permittee shall conduct the following radiological monitoring: a. Liquid Radwaste discharge, surface water and drinking water supply:

LOCATION FREQUENCY SAMPLE TYPE I. Radwaste building discharge a) Batch Releases prior to each batch a representative grab sample of each batch discharge b) Steam Generator once per day a representative Blowdown when discharging grab sample

II. Upstream of discharge line once/month grab

III. Downstream of discharge daily with composite line at Portland, MO monthly composite analysisPage 11 of 21

Permit No. MO-0098001

Samples of Batch Releases are to be analyzed for tritium, I-131, and gamma isotopic for each batch; and for Sr-89, Sr-90, and Fe-55 in a quarterly composite of each batch.

Samples of Steam Generator Blowdown are to be analyzed for tritium, I-131, and gamma isotopic in daily samples; and for Sr-89, Sr-90, and Fe-55 in a quarterly composite of daily samples.

Samples of Surface Water are to be analyzed fo r tritium and gamma isotopic in monthly samples.

b. Aquatic biota - semiannual sampling of the edible flesh of up to five commercially or recreationally important species of fish of sufficient quantity to yield a sufficient sample. Sample s are to be taken at the locations specified in II and III. Samples are to be analyzed by gamma isotopic an alysis. Catfish need not be included in sample.

c. Bottom Sediment - semiannual samples of bottom sediment from the locations specified in II and III. Samples are to be analyzed by gamma isotopic analysis.

d. Results of the above monitoring programs shall be reported to the Department by supplying a copy of the Annual Radiological Environmental Operating Report per Technical Specification 5.6.2 and the Annual Radioactive Effluent Release Report per Technical Specification 5.6.3 at the same time they are supplied to NRC. All data information shall be available for inspection during normal working hours.

e. The Department of Natural Resources of the State of Misso uri, and any other state agency or officer designated in the State's emergency response plan or any other plan to protect its citizens from radioactive liquid discharge from the Callaway Plant, shall receive w ithin one hour of the event, notice of any unplanned or uncontrolled liquid radioactive

release in accordance with 10 CF R 50.72(a) and notification of reportable events per 10 CFR 20.2203 that involve offsite releases of liquid radioactive material.

6. Changes in Discharges of Toxic Substances

The permittee shall notify the Director as so on as it knows or has reason to believe: (a) That any activity has occurred or will occur which would re sult in the discharge of any toxic pollutant which is not limited in the permit, if that di scharge will exceed the highest of th e following "notification levels:" (1) One hundred micrograms per liter (100 μg/L); (2) Two hundred micrograms per liter (200 μg/L) for acrolein and acrylonitrile; five hundred micrograms per liter (500 μg/L) for 2,5 dinitrophenol and for 2-methyl-4, 6-dinitrophenol; and one milligram per liter (1 mg/L) for antimony; (3) Five (5) times the maximum concentration value reported for the pollutant in the permit application; (4) The level established in Part A of the permit by the Director. (b) That they have begun or expect to begin to use or manufacture as an intermediate or final product or byproduct any toxic pollutant, which was not reported in the permit application.

7. Permittee is exempt from section 311 and superfund reporting under 40 CFR 117.12 (a) 1-3 for the following chemicals: Ammonium Hydroxide, Ethylene Glycol, Hydrazine, Sodium Hydroxide, Sodium Hypochlorite, Sulfuric Acid, and Phosphoric Acid.

8. The 316 (b) study was done in 1984 and 1986. Since there have been no changes to the intake structure, the study is approved for this permit cycle.

9. The company has elected to use Best Management Practices on Storm water outfalls. Monitoring is waived for this perm it cycle. If problems occur, monitoring will be re-established by the department. Periodic inspection of these outfalls will be carried out by the permittee to ascertain that BMPs are work ing. The permittee will create and implement a Storm Water Pollution Prevention Plan that outlines the BMPs to be used. This will be kept at the site and must be made available to inspectors upon request.

10. The Permittee has submitted a letter dated May 30, 2008 stating that none of the chemicals listed at 40 CFR 423 Append ix A as required at 40 CFR 423 .13 (d)(1) are used . This submittal is allowed at 40 CFR 423.13 (d) (3) and was submitted prior to the issuance of this permit. It is a part of the permit file for this facility.

11. Reserved for heat issues.Page 12 of 21

Permit No. MO-0098001 12. Acute Whole Effluent Toxicity (WET) tests will be conducted as follows:

SUMMARY OF ACUTE WET TESTING FOR THIS PERMIT

OUTFALL AEC LC50%* FREQUENCY SAMPLE TYPE MONTH

001 33.3% 10%, unless

diffusers in place Once/ 5 years when

molluscicide is used 24 hr. composite Any, Report by 1-28-2010

002 33.3% 10%, unless

diffusers in place Annually, when

treatment’s

molluscicide and algaecide are used in

same month. 24 hr. composite Any month treatments are applied--report in January. If no treatment by December, test in

December

016 33.3% 10%, unless

diffusers in place Same as #002 24 hr. composite Same as #002

 LC50 = AEC / 0.3.

Dilution Series

100% 50% 25% 12.5% 6.25% (Control) 100% upstream, if

available (Control) 100% Lab Water, also called synthetic water

(a) Test Schedule and Follow-Up Requirements (1) Perform a MULTIPLE-dilution acute WET test in the mont hs and at the frequency specified above. For tests which are successfully passed, submit test results using the Department’s WET test report form #MO-780-1899 along with complete copies of the test reports as recei ved from the laboratory, incl uding copies of chain-ofcustody forms within 30 calendar days of availability to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102. If the effluent passes the te st, do not repeat the test until the next test period. (a) For discharges of stormwater, samples shall be coll ected within three hours from when discharge first

occurs. (b) Samples submitted for analysis of stormwater discharges shall be collected as a grab. (c) For discharges of non-stormwater, samples shall be collected only when precipitation has not occurred for a period of forty-eight hours prior to sample collec tion. In no event shall sample collection occur simultaneously with the occurrence of precip itation excepting for stormwater samples. (d) A twenty-four hour composite sample shall be subm itted for analysis of non-stormwater discharges. (e) Upstream receiving water samples, where required, shall be collected upstream from any influence of the

effluent where downstream fl ow is clearly evident. (f) Samples submitted for analysis of upstream receiving wa ter may be collected as e ither a grab or twentyfour-hour composite as appropriate to the natu re of the discharge. (g) Chemical and physical analysis of the upstream control and effluent sample shall occur immediately upon being received by the labo ratory, prior to any mani pulation of the effluent sample beyond preservation methods consistent with federal guidelines for WET te sting that are required to stabilize the sample during shipping. (h) Any and all chemical or physical analysis of the e ffluent sample performed in conjunction with the WET test shall be performed at the 100% Effluent concentration in addition to analyses performed upon any

other effluent concentration. (i) All chemical analyses included in the Missouri Department of Natural Resources WET test report form #MO-780-1899 shall be performed and results shall be recorded in the appropriate field of the report form. (j) Where flow-weighted composite sample is required for analysis, the samples shall be composited at the laboratory where the test is to be performed. (k) Where in stream testing is required downstream from the discharge, sample collection shall occur immediately below the established Zone of Initial Dilution in conjunction with or immediately following a release or discharge.Page 13 of 21

Permit No. MO-0098001

(l) Samples submitted for analysis of downstream receiving water may be collected as either a grab or twentyfour-hour composite as a ppropriate to the nature of the discharge. (m) All instream samples, including downstream samples, sh all be tested for toxicity at the 100% concentration in addition to any other assigned AEC for in-stream samples. (2) All failing test results along with complete copies of the test reports as received from the laboratory, INCLUDING THOSE TESTS CONDUCTED UNDER CONDITION (3) BELOW, shall be reported to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the availability

of the results. (3) If the effluent fails the test, a multiple dilution test sh all be performed for BOTH test species within 30 calendar days and biweekly thereafter (for storm water, tests shall be performed on the next and subsequent storm water discharges as they occur, but not less than 7 days apart) until one of the following conditions are met: (a) THREE CONSECUTIVE MULTIPLE-DILUTION TESTS PA SS. No further tests need to be performed until next regularly scheduled test period. (b) A TOTAL OF THREE MULTIPLE-DILUTION TESTS FAIL. (4) Failure of at WET tests is a violation of this permit. (5) The permittee shall submit a summary of all test results for the test series along with complete copies of the test reports as received from the laboratory to the WATER PROTECTION PROGR AM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the third failed test. (6) Additionally, the following shall apply upon failure of the third MULTIPLE DILUTION test: A toxicity identification evaluation (TIE) or toxicity reduction evalua tion (TRE) is automatically triggered. The permittee shall contact THE WATER PROTECTION PROGRAM within 14 calendar days from availability of the test results to ascertain as to whether a TIE or TRE is approp riate. The permittee shall submit a plan for conducting a

TIE or TRE to the WATER PROTECTION PROGRAM within 60 calendar days of the date of DNR's direction to perform either a TIE or TRE. This plan must be approved by DNR before the TIE or TRE is begun. A schedule for completing the TIE or TRE shall be established in the plan approval. (7) Upon DNR's approval, the TIE/TRE schedule may be modified if toxicity is intermittent during the TIE/TRE investigations. A revised WET test schedule may be established by DNR for this period. (8) If a previously completed TIE has clearly identified the cause of toxicity, add itional TIEs will not be required as long as effluent characteristics remain essentially uncha nged and the permittee is proceeding according to a DNR approved schedule to complete a TRE and reduce toxicity. Regularly scheduled WET testing as required in the permit, without the follow-up requirements, will be required during this period. (9) Submit a concise summary in tabular format of all WET test results with the annual report.

(b) PASS/FAIL procedure and effluent limitations: (1) To pass a multiple-dilution test: (a) For facilities with a computed percent effluent at the edge of the zone of initial dilution, Allowable Effluent Concentration (AEC) OF 30% OR LESS, the AEC mu st be less than three-tenths (0.3) of the LC 50 concentration for the most sensitive of the test organisms; OR

, (b) For facilities with an AEC greater than 30%, the LC50 concentration must be greater than 100%; AND

, (c) All effluent concentrations equal to or less than the AEC must be nontoxic. Mortality observed in all effluent concentrations equal to or less than the AEC shall not be significantly different (at the 95% confidence level; p = 0.05) than that observed in the upstream recei ving-water control sample. Where upstream receiving water is not available mortality obs erved in the AEC test concentration shall not be significantly different (at the 95% confidence level; p = 0.05) than that observed in the laboratory control. The appropriate statistical tests of significance sh all be consistent with the most current edition of

METHODS FOR MEASURING THE ACUTE TOXICITY OF EFFLUENTS AND RECEIVING

WATERS TO FRESHWATER AND MARINE ORGANISMS or other federal guidelines as appropriate or required. Failure of one multiple-dilution test may be considered an effluent limit violation.Page 14 of 21

Permit No. MO-0098001

(c) Test Conditions (1) Test Type: Acute Static non-renewal (2) All tests, including repeat tests for previous failu res, shall include both test species listed below. (3) Test species: Ceriodaphnia dubia and Pimephales promelas (fathead minnow). Organisms used in WET testing shall come from cultures reared for the purpose of conducting toxicity tests and cultured in a manner consistent with the most current USEPA guidelines. All test animal s shall be cultured as described in the most current

edition of Methods for Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine Organisms

. (4) Test period: 48 hours at th e "Acceptable Effluent Concentra tion" (AEC) specified above. (5) Upstream receiving stream water shall be used as dilution water. If upstream water is unavailable or if mortality in the upstream water exceeds 10%, "reconstituted" wa ter will be used as dilution water. Procedures for generating reconstituted water will be supplied by the MDNR upon request. (6) Multiple-dilution tests will be run with: (a) 100%, 50%, 25%, 12.5%, and 6.25% effluent, unless the AEC is less than 25% effluent, in which case dilutions will be 4 times the AEC, two times the AEC, AEC, 1/2 AEC and 1/4 AEC; (b) 100% receiving-stream water (if availa ble), collected upstream of the outfa ll at a point beyond any influence of the effluent; and (c) Reconstituted water. (7) If reconstituted-water control mortality for a test sp ecies exceeds 10%, the entir e test will be rerun. (8) If upstream control mortality exceeds 10%, the entire test will be rerun using reconstituted water as the dilutant.Page 15 of 21

Permit No. MO-0098001

SUMMARY OF TEST METHODOLOGY FOR WHOLE-EFFLUE NT TOXICITY TESTS

Whole-effluent-toxicity test required in NPDES permits shall use the following test conditions when performing single or multip le dilution methods. Any future changes in methodology will be supplied to the permittee by the Missouri Department of Natural Resources (MDNR). Unless more stringent me thods are specified by the DN R, the procedures shall be consistent with the most

current edition of Methods for Measuring the Acute Toxicity of Efflue nts and Receiving Waters to Freshwater and Marine Organisms

,

Test conditions for Ceriodaphnia dubia:

Test duration: 48 h Temperature: 25  1°C Temperatures shall not deviate by more than 3°C during

the test. Light Quality: Ambient laboratory illumination Photoperiod: 16 h light, 8 h dark Size of test vessel: 30 mL (minimum) Volume of test solution: 15 mL (minimum) Age of test organisms: <24 h old

No. of animals/test vessel: 5 No. of replicates/concentration: 4 No. of organisms/concentration: 20 (minimum) Feeding regime: None (feed prior to test)

Aeration: None Dilution water: Upstream r eceiving water; if no upstream flow, synthetic water

modified to reflect effluent hardness. Endpoint: Pass/Fail (Statistically significant Mortality when compared to upstream receiving water control or synthetic control if upstream water was not available at p< 0.05) Test acceptability criterion: 90% or greater survival in controls

Test conditions for ( Pimephales promelas ):

Test duration: 48 h Temperature: 25  1°C Temperatures shall not deviate by more than 3°C during

the test. Light Quality: Ambient laboratory illumination Photoperiod: 16 h light/ 8 h dark Size of test vessel: 250 mL (minimum) Volume of test solution: 200 mL (minimum) Age of test organisms: 1-14 days (all same age)

No. of animals/test vessel: 10 No. of replicates/concentration: 4 (minimum) single dilution method 2 (minimum) multiple dilution method No. of organisms/concentration: 40 (minimum) single dilution method 20 (minimum) multiple dilution method Feeding regime: None (feed prior to test) Aeration: None, unless DO concentration falls below 4.0 mg/L; rate should

not exceed 100 bubbles/min. Dilution water: Upstream receiving water; if no upstream flow, synthetic water

modified to reflect effluent hardness. Endpoint: Pass/Fail (Statistically significant Mortality when compared to upstream receiving water control or synthetic control if upstream water was not available at p< 0.05) Test Acceptability criterion: 90% or greater survival in controlsPage 16 of 21

Permit No. MO-0098001 13. Chronic Whole Effluent Toxicity (CWET) Tests shall be conducted as follows :

SUMMARY OF CHRONIC WET TES TING FOR THIS PERMIT

OUTFALL CHRONIC

CRITICAL DILUTION (CCD) % ** EFFLUENT DILUTION

SERIES (one dilution must be CCD) FREQUENCY SAMPLE

TYPE MONTH

#002 10% by default unless diffusers in place 40, 20,10,5, 2.5 % Once per 5 years, when treatment’s molluscicide and algaecide are used in same month 24 hr composite Any, month
treatment are applied--report in January 2010. If no treatments by December, test in December

If the CCD is 25% or less dilutions will be 4 times the CCD, two times the CCD, CCD, 1/2 CCD and 1/4 CCD. No CCD can be less than 10% unless an approved diffuser is in place.

Test Parameter to be reported Pass/Fail Survival [TLP3B]+

N o Observable Effect Concentration (lethal) on Survival [TOP3B]+

Lowest Observable Effect Concentration (lethal) on Survival [TXP3B]+ % Mortality at Critical Dilution [TJP3B]+ Pass/Fail Reproduction [TGP3B]+

No Observable Effect Concentration (sublethal) on Reproduction [TPP3B]+

Lowest Observable Effect Concentration (sublethal) on Reproduction [TYP3B]+ Ceriodaphnia dubia , 7- day chronic NOEC static renewal,

freshwater

Highest % Coefficient of Variation* [TQP3B]+

Pass/Fail Survival [TLP6C]+

N o Observable Effect Concentration (lethal) on Survival [TOP6C] +

Lowest Observable Effect Concentration (lethal) on Survival [TXP6C] + % Mortality at Critical Dilution [TJP6C]+ Pass/Fail Growth [TGP6C]+

No Observable Effect Concentration (sublethal) on Growth [TPP6C] +

Lowest Observable Effect Concentration (sublethal) on Growth [TYP6C]+ Pimephales promelas (Fathead minnow), 7- day chronic NOEC static renewal,

freshwater

Highest % Coefficient of Variation * [TQP6C] +

* for the Chronic Critical Dilution or Control + items in brackets are for WPP use only

** CCD= (design flow of outfall in cfs) / ((7Q10*0.25) + desi gn flow of outfall in cfs)), but not less than 10% unless diffuser in place.Page 17 of 21

Permit No. MO-0098001

(a) Chronic WET Test Schedule and Follow-Up Requirements (1) Perform a CHRONIC MULTIPLE-d ilution test in the months and at the frequency specified above. For tests which are successfully passed, submit test with complete copies of the test re ports as received from the laboratory, including copies of chain-of-custody forms within 30 calendar days of availability to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102. If the effluent passes the chronic test, do not repeat the test until the next test period. (a) A twenty-four hour composite sample shall be subm itted for analysis of non-stormwater discharges. (b) Upstream receiving water samples shall be collected upst ream from any influence of the effluent discharge. (c) Samples submitted for analysis of upstream r eceiving water may be collected as a grab. (d) Chemical and physical analysis of the upstream control and effluent sample shall occur immediately upon being received by the labo ratory, prior to any mani pulation of the effluent sample beyond preservation methods consistent with federal guidelines for WET te sting that are required to stabilize the sample during shipping. (e) Any and all chemical or physical analysis of the effl uent sample performed in conjunction with the chronic WET test shall be performed at the CCD effluent concentration and the 100% effluent concentration. (f) (reserved) (g) Where flow-weighted composite sample is required for analysis, the samples shall be composited at the laboratory where the test is to be performed. (h) Where in stream testing is required downstream from the discharge, sample collection shall occur immediately below the established Zone of Initial Dilution in conjunction with or immediately following a release or discharge. (i) Samples submitted for analysis of downstream recei ving water may be collected as a twenty-four-hour composite. (j) All instream samples, including downstream samples, sh all be tested for toxicity at the 100% concentration in addition to any other assigned CCD for in-stream samples. (k) If the upstream water is unsatisfactory as a result of instream toxicity, the permittee must submit the test results exhibiting receiving water toxi city with the full test report and may thereafter substitute synthetic dilution water for the receiving water in all subsequent tests. (2) All failing test results along with complete copies of the test reports as received from the laboratory, INCLUDING THOSE TESTS CONDUCTED UNDER CONDITION (3) BELOW, shall be reported to the WATER PROTECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the availability

of the results. (3) If the effluent fails the test, another multiple dilution test shall be performed within 30 calendar days and biweekly thereafter, until one of the following conditions are met: (a) TWO CONSECUTIVE MULTIPLE-DILUTION TESTS PASS. No further tests need to be performed until next regularly scheduled test period. (b) A TOTAL OF THREE MULTIPLE-DILUTION TESTS FAIL. (9) Failure of at least two multiple-dilutio n tests during any period of accelerated monitoring violates the permit and the narrative requirement for aquatic life protection. (10) The permittee shall submit a summary of all chronic test results for the test series along with complete copies of the test reports as received from the laboratory to the WATER PRO TECTION PROGRAM, P.O. Box 176, Jefferson City, MO 65102 within 14 calendar days of the second failed test. (1 1) Additionally, the following shall apply upon failure of the third MULTIPLE DILUTION test: A chronic toxicity identification evaluation (TIE) or chronic toxicity reduc tion evaluation (TRE) is automatically triggered. The permittee shall contact THE WATER PR OTECTION PROGRAM within 14 calendar days from availability of

the test results to ascertain as to whether a chronic TIE or chronic TRE is appropriate. The permittee shall submit a plan for conducting a chronic TIE or TRE to the WATER PROTECTION PROGRAM within 60 calendar days of the date of DNR's direction to perform either a chronic TIE or TRE. This plan must be approved by DNR before the chronic TIE or TRE is begun. A schedule for completing the chronic TIE or TRE shall be established in the plan approval. (12) Upon DNR's approval, the chronic TIE/TRE schedule may be modified if toxicity is intermittent during the chronic TIE/TRE investigations. A revised WET test schedule may be established by DNR for this period. (13) If a previously completed chronic TIE has clearly identifie d the cause of toxicity, additional chronic TIEs may not be required as long as effluent characteristics remain essentially unchanged and the permittee is proceeding according to a DNR approved schedule to complete a chronic TRE and reduce toxi city. The time period for completing a TRE shall not exceed 28 months.Page 18 of 21

Permit No. MO-0098001

(14) During the period that a TRE is being conducted, qua rterly chronic WET testing will be required (without the follow-up requirements) even if the permit calls for yearly testing only.

(10) When WET test sampling is required to run over one DMR period, each DMR report shall contain a copy of the Department’s WET test report form that was generated during the reporting period. (11) Submit a concise summary in tabular format of all WET test results with the annual report.

(b) Test Conditions (9) Test Type: Chronic Static renewal (10) All tests, including repeat tests for previous failu res, shall include both test species listed below. (11) Test species: Ceriodaphnia dubia and Pimephales promelas (fathead minnow). Organisms used in WET testing shall come from cultures reared for the purpose of conducting toxicity tests and cultured in a manner consistent with the most current USEPA guidelines. All test animal s shall be cultured as described in the most current

edition of Short Term Methods for Measuring the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms

. (12) Upstream receiving stream water shall be used as dilution water. If upstream water is unavailable or if mortality in the upstream water exceeds 20%, "reconstituted" wa ter will be used as dilution water. Procedures for generating constituted water will be supplied by the MDNR upon request. (13) Multiple-dilution tests will be run with the dilution series indicated at the beginning of this special condition and 100% receiving-stream water (if availa ble), collected upstream of the outfall at a point beyond any influence of

the effluent. (14) If reconstituted-water control mortality for a test sp ecies exceeds 20%, the entir e test will be rerun. (15) If upstream control mortality exceeds 20%, the entire test will be rerun using reconstituted water as the dilutant. (16) See the attachment to the permit entitled “Summary of Test Conditions and Methods for Chronic Whole Effluent Toxicty Tests” for more test conditions.

(c) Methodology

(1) Ceriodaphnia dubia chronic static renewal 7-day survival and reproduction test, Method 1002.0, EPA-821-R-02- 013 (October 2002. A minimum of ten (10) replicates with one (1) organism per test chamber, must be used in

the control and in each of the 5 effluent dilutions of this test. One of the effluent dilutions must be the critical dilution as specified in the permit special conditions. This test should be terminated when 60% of the surviving females in the control produce three broods or at the end of eight days, whichever comes first. If these criteria are not met at the end of 7 days, the test must be repeated. (2) Pimephales promelas (Fathead minnow) chronic static renewal 7-day larval survival and growth test, Method 1000.0, EPA-821-R-02-013 (October 2002). A minimum of five (5) replicates with ten (10) organisms per replicate must be used in the control and in each of the 5 effluent dilutions of this test. One of the effluent dilutions must be the critical dilution as specified in the permit special conditions. This test should be terminated at the end of 7 days. (3) The NOEC L (No Observed Lethal Effect Concentration) is defined as the greatest effluent dilution at and below which lethality that is statistically different from the control (0% effluent) at the 95% confidence level does not

occur. Chronic lethal te st failure (chronic NOEC L test) is defined as a demonstration of a statistically significant lethal effect at test completion to a test species at or below the critical dilution. (4) The NOEC S (No Observed Sublethal Effect Co ncentration) is defined as the greatest effluent dilution at and below which sublethality (inhi bited reproduction in the Ceriodaphnia dubia test or inhibited growth in the Fathead minnow test) that is statistically different from th e control (0% effluent) at the 95% confidence level does not occur. Chronic sublethal test failure (chronic NOECS test) is defined as a demonstration of a statistically significant sublethal effect at te st completion to a test species at or below the critical dilution.

(d) Test acceptance

(1) The permittee shall repeat a test, including the control and all effluent dilutions, if the procedures and quality assurance requirements defined in the test methods or in this permit are not satisfied, including the following

additional criteria: (2) The toxicity test control (0% effluent) must have survival equal to or greater than 80%.Page 19 of 21

Permit No. MO-0098001

(3) The mean number of Ceriodaphnia dubia neonates produced per surviving female in the control (0% effluent)

must be 15 or more. (4) Sixty (60) percent or more of the surviving Ceriodaphnia dubia control females must produce three broods. (5) The mean dry weight of the surviving Fathead minnow larvae at the end of the 7 days in the control ( 0% effluent) must be 0.25 mg per larvae or greater. (6) The percent coefficient of variation between replicates shall be 40% or less in the control (0% effluent) for the young of surviving females in the Ceriodaphnia dubia reproduction test and for the growth and survival endpoints

of the Fathead minnow test. (7) The percent coefficient of variation between replicates shall be 40% or less in the critical dilution, unless significant lethal or sublethal effects are exhibited for the young of surviving females in the Ceriodaphnia dubia reproduction test and for the growth and survival endpoints of the Fathead minnow test. (17) 60% or more of the surviving Ceriodaphnia dubia in the control or all of the dilutions must be female. This must

be confirmed at the end of the test.

(e) Statistical Interpretation

(1) For the Ceriodaphnia dubia survival test, the statistical analyses us ed to determine if there is a significant

difference between the control and the critical dilution sh all be in accordance with the methods for determining

the No Observed Effect Co ncentration (NOEC) as described in EP A-821-R-02-013 or most recent update (2) For the Ceriodaphnia dubia reproduction test and the Fathead minnow larval survival and growth test, the statistical analyses used to determine if there is a significant difference between the control and the critical

dilution shall be in accordance with the methods for dete rmining the No Observed Effect Concentration (NOEC)

as described in EPA-821-R-02-013 or most recent update. 03-07Page 20 of 21

Permit No. MO-0098001

SUMMARY OF TEST CONDITIONS AND METHOD S FOR CHRONIC WHOLE-E FFLUENT TOXICITY TESTS Chronic Whole Effluent Toxicity tests required in NPDES permit s shall use the following test conditions when performing single or multiple dilution methods. Any future changes in methodology will be supplie d to the permittee by the Missouri Department of Natural Resources (MDNR). Unless more stri ngent methods are specified by the DNR, the procedures shall be consistent with the

most current edition of Short Term Methods for Measuring the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms.

Test conditions for Ceriodaphnia dubia: Test type: static renewal Duration 7 days, or when 60% of control animals produce 3 broods, but not more than 8 days

Effect measured decrease in reproduction, death Temperature: 25  1°C Temperatures shall not deviate by more than 3°C during

the test. Light Quality: Ambient laboratory illumination (50-100 ft-c) Photoperiod: 16 h light, 8 h dark Size of test vessel: 30 mL (minimum) Volume of test solution: 15 mL (minimum) Test solution replacement frequency Daily Age of test organisms: less than 24 hour old No. of test concentration 5, one must be th e critical dilution indicated in permit special

conditions for chronic WET tests

No. of animals/test vessel: 1 No. of replicates/concentration: 10 No. of organisms/concentration: 10 Feeding regime: 0.1 mg/day of trout chow, cerophyll, and yeast

Aeration: None Dilution water: Upstream r eceiving water; if no upstream flow, synthetic water

modified to reflect effluent hardness. Endpoint: The highest concentration that causes no observed effect (NOEC)

and the lowest concentration that does cause an effect LOEC) for survival and reproductionPage 21 of 21

Permit No. MO-0098001

Test conditions for ( Pimephales promelas ): Test type Static renewal Test duration: 7 days

Effect measured decrease in growth (weight), death Temperature: 25  1°C Temperatures shall not deviate by more than 3°C during

the test. Light Quality: Ambient laboratory illumination (50-100 ft-c) Photoperiod: 16 h light/ 8 h dark Size of test vessel: 300-500 mL (minimum) Volume of test solution: 250 mL (minimum) Test solution replacement frequency Daily Age of test organisms: less than 48 hours (all same age within 8 hours) No. of test concentrations 5, one must be the critical dilution indicated in permit special

conditions for chronic WET test

No. of animals/test vessel: 10 No. of replicates/concentration: 5 (minimum) No. of organisms/concentration: 50 (minimum) single dilution method Feeding regime: 0.1 ml containing 700-1000 brine shrimp 3 times a day at 4 hour

intervals Aeration: None, unless DO concentration falls below 4.0 mg/L; rate should

not exceed 100 bubbles/min. Dilution water: Upstream receiving water; if no upstream flow, synthetic water

modified to reflect effluent hardness. Endpoint: The highest concentration that causes no observed effect (NOEC)

and the lowest concentration that does cause an effect LOEC) for survival and growth (03-07)Missouri Department of Natural Resources

F ACT S HEET

F OR THE P URPOSE OF R ENEWAL OF MO-0098001

A MEREN UE, C ALLAWAY P OWER P LANT

The Federal Water Pollution Control Act ("Clean Water Act" Secti on 402 Public Law 92-500 as amended) established the National Pollution Discharge Elimination System (NPDES) permit program. This program regulates the discharge of pollutants from point

sources into the waters of the United States , and the release of storm water from certain point sources. All such discharges a re unlawful without a permit (Section 301 of the "Clean Water Act"). After a permit is obtained, a discharge not in compliance wi th all permit terms and conditions is unlawful. Missouri State Operating Permits (MSOPs) are issued by the Director of the Missouri Department of Natural Resources (departmen t) under an approved program, operating in accordance with federal and state laws (Federal "Clean Water Act" and "Missouri Clean Water Law" S ection 644 as amended). MSOPs are issued for a period of five (5) years unless otherwise specified.

As per [40 CFR Part 124.8(a)] and [10 CSR 20-6.020(1)2.] a Factsheet shall be prepared to give pertinent information regarding the applicable regulations, rationale for the development of effluent limitations and conditions, and the public participation proc ess for the Missouri State Operating Permit (operating permit) listed below.

A Factsheet is not an enforceable part of an operating permit.

This Factsheet is for a Major , Industrial Facility

Part I – Facility Information

Facility Type: Industrial Facility SIC Code(s): 4911

Facility Description: nuclear power plant

Application Date: March 20. 2008 Expiration Date: October 2, 2008 Last Inspection: In Compliance ;

O UTFALL ( S ) T ABLE :

O UTFALL D ESIGN F LOW (CFS) T REATMENT L EVEL E FFLUENT TYPE D ISTANCE TO
C LASSIFIED S EGMENT ( MI )

#001 0.46 none Rad waste 0

#002 22.32 none Cool tower blowdown 0

#003 2.55 none Water treatment plant waste 0

#007 0.06 Sanitary waste water lagoon Sanitary waste water lagoon 0

#009 0.009 Intake heater

blowdown Intake heater blowdown 0

#010 7.13 Settling pond Storm Water 1.5

#011 30.54 Settling pond Storm Water 2.0

#012 10.23 Settling pond Storm Water 4.5

#013 eliminated

--- Now flows to #012

---

#014 7.44 Settling pond Storm Water 4.0

#015 4.34 Settling pond Storm Water 4.0

#016 22.32 Settling pond Cooling Tower bypass 0

#017 0 none Ultimate heat sink 0Water Quality History : No significant non compliances. Had radiation (Tritium) leak in main discharge pipeline. New line is now completed.

Comments: All radioactive analytes are regulated by Nuclear Regulatory Commission, not the Missouri Department of Natural

Resources.

Part II – Operator Certification Requirements

As per [10 CSR 20-6.010(8) Terms and Conditions of a Permit], pe rmittees shall operate and maintain facilities to comply with t he Missouri Clean Water Law and applicable permit conditions and regu lations. Operators or supervisors of operations at regulated

wastewater treatment facilities shall be cer tified in accordance with [10 CSR 20-9.020(2)] and any other applicable state law o r regulation. As per [10 CSR 20-9.010(2)(A)], requirements fo r operation by certified personnel sh all apply to all wastewater tr eatment systems, if applicable, as listed below:

Check boxes below that are applicable to the facility;

 Population Equivalent greater than two hundred (200):

This facility currently requires an operator with D Certification Level. Please see Appendix 1 - Classification Worksheet

. Modifications made to the wastewater treatment f acility may cause the classification to be modified.

Operator’s Name: Steven Weiss, Ameren Servic es, 1901 Chouteau Ave, St. Louis, MO 63166

Certification Number: 9639

Certification Level: A

Part III – Receiving Stream Information

A PPLICABLE D ESIGNATIONS OF W ATERS OF THE S TATE : As per Missouri’s Effluent Regulations [10 CSR 20-7.015], the waters of the state are divided into the below listed seven (7) categories. Each category list effluent limitations for specific parameters, which are presented in each outfall’s Effluent Li mitation

Table and further discussed in the Derivation & Discussion of Limits section.

Missouri or Mississippi River [10 CSR 20-7.015(2)]:

10 CSR 20-7.031 Missouri Water Quality Standards, the department defines the Clean Water Commission water quality objectives in

terms of "water uses to be maintained and the criteria to protect those uses." The receiving stream and/or 1 st classified receiving

stream’s beneficial water uses to be maintained are located in the Receiving Stream Table locat ed below in accordance with [10 CSR 20-7.031(3)].

R ECEIVING S TREAM ( S ) T ABLE :

W ATERBODY N AME C LASS WBID D ESIGNATED U SES *

Mud Creek U

-- Narrative criteria

Logan Creek U

-- Narrative criteria

Cow Branch U

-- Narrative criteria

Missouri River P 00701 IRR,LWW,AQL,SCR, DWS,IND,WBC*** 8-D IGIT
HUC

10300102 EDU**

O ZARK /

M OREAU /

L OUTRE

* - Irrigation (IRR), Livestock & Wildlife Watering (LWW), Prot ection of Warm Water Aquatic Life and Human Health-Fish Consumption (AQL), Cool Water Fishery(CLF), Cold Water Fishery (CDF), Whole Body Contact Recreation (WBC), Secondary Contact Recreation (SCR), Drinking Water Supply (DWS), Industrial (IND), Groundwater (GRW). ** - Ecological Drainage Unit *** - UAA conducted on 7-13-2005 and approved on DATE or disapproved on DATE.R ECEIVING S TREAM ( S ) L OW -F LOW V ALUES T ABLE :

L OW -F LOW V ALUES (CFS) R ECEIVING STREAM (U, C, P) 1Q10 7Q10 30Q10

Cow Creek U 0 0 0

Mud Creek U 0 0 0

Logan Creek U 0 0 0

Missouri River P 61,000

M IXING C ONSIDERATIONS T ABLE :

M IXING Z ONE (CFS) [10 CSR 20-7.031(4)(A)4.B.(II)(a)] Z ONE OF I NITIAL D ILUTION (CFS) [10 CSR 20-7.031(4)(A)4.B.(II)(b)]
1Q10 7Q10 30Q10 1Q10 7Q10 30Q10

15,250 1,525

R ECEIVING S TREAM M ONITORING R EQUIREMENTS :

No receiving water monitoring requ irements recommended at this time.

Part IV – Rationale and Der ivation of Effluent Limitation s & Permit Conditions

A LTERNATIVE E VALUATIONS FOR N EW F ACILITIES : As per [10 CSR 20-7.015(4)(A)], discharges to losing streams sh all be permitted only after other alternatives including land application, discharges to a gaining stream and connection to a regional wastewater treatment facility have been evaluated and determined to be unacceptable for envir onmental and/or economic reasons.

Not Applicable ; The facility does not discharge to a Losing Stream as defined by [10 CSR 20-2.010(36)] & [10 CSR 20-7.031(1)(N)], or is an exis ting facility.

A NTI

- BACKSLIDING : A provision in the Federal Regulations [CWA §303(d)(4); CWA §402(c); 40 CFR Part 122.44(I)] that requires a reissued permit to be as stringent as the previous permit with some exceptions.

- All limits in this Factsheet are at l east as protective as those previously estab lished; therefore, backsliding does not app ly.

A NTIDEGRADATION : In accordance with Missouri’s Water Qua lity Standard [10 CSR 20-7.031(2)], the de partment is to document by means of Antidegradation Review that the use of a wate r body’s available assimilative capacity is justified. Degradation is justified b y documenting the socio-economic im portance of a discharging activity after dete rmining the necessity of the discharge.

- Renewal - no degradation proposed and no further review necessary.

A PPLICABLE P ERMIT P ARAMETERS : Effluent parameters contained in Factsheets and Missouri State Operating Permits are obtained from Technology Based Effluent Li mit (TBEL), Missouri’s Effluent Regulations [10 CSR 20-7.015], Missouri’s Water Quality Standards [10 CSR 20-7.031], previous Missouri State Operating Permits, and from Operating Permit Applications.B IO

- SOLIDS , S LUDGE , & S EWAGE S LUDGE : Bio-solids are solid materials resulting from wastewater treatment that meet federal and state criteria for beneficial uses (i. e. fertilizer). Sludge is any solid, semi-solid, or liquid waste generated from a municipal, commercial, or indust rial wastewater treatment pla nt, water supply treatment plant, or air pollution control facility or any other such waste having similar characteristics and effe ct. Sewage sludge is solids, semi-solids, or liquid residue generated during the treatment of domestic sewage in a treatment works; includ ing but not limited to, domestic septage; scum or solids removed in primary, secondary, or advanced wastewater treatment process; and a material derived from sewage sludge. Sewage sludge does not in clude ash generated during the firing of sewage sludge in a sewa ge sludge incinerator or grit and screening generated during preliminary treatment of domestic sewage in a treatment works.

Applicable (renewal and modifications to existing operating permits) ; This facility has been approved to land apply as per Permit Standard Conditions III and a department approved bio-solids manage ment plan.

C OMPLIANCE AND E NFORCEMENT : Enforcement is the action taken by the Water Protection Program (WPP) to bring an entity into compliance with the Missouri Clea n Water Law, its implementing regulations, and/or any terms and conditions of an operating permit. The primary purpose of the enforcement activity in the WPP is to resolve viol ations and return the entity to compliance.

Not Applicable ; The permittee/facility is not currently under Water Protection Program enforcement action.

P RETREATMENT P ROGRAM : The reduction of the amount of pollutants, the elimination of pollutants, or the alteration of the nature of pollutant properti es in wastewater prior to or in lieu of discharging or otherwise intr oducing such pollutants into a Publicly Owned Treatment Works [4 0 CFR Part 403.3(q)].

Not Applicable ; At this time, the permittee is not required to implement and enforce a Pretreatment Program.

R EMOVAL E FFICIENCY : Removal efficiency is a method by which the Federal Regulations define Secondary Treatment and Equivalent to Secondary Treatment, which applies to Biochemical Oxygen Demand 5-day (BOD 5 ) and Total Suspended Solids (TSS) for Publicly Owned Treatment Works (POTWs). Please see the United States Environmental Protection Agency’s (EPA) website for interpretation of percent removal requirements for National Pollutant Discharge Elimination System Permit Application Requirements for Publicly Owned Treatment Works and Other Treatment Works Treating Domestic Sewage @ www.epa.gov/fedrgstr/EPAWATER/1999/August/Day-04/w18866.htm

Not Applicable ; This wastewater treatment facility is not a POTW. Influent monitoring is not being required to determine percent removal.

S ANITARY S EWER O VERFLOWS (SSO S ), AND I NFLOW & I NFILTRATION (I&I): Collection systems are a critical element in the successful performa nce of the wastewater treatment process. Under certain con ditions, poorly designed, built, managed, operated, and/or maintained systems can pose risks to public health, the environment, or both. Causes of SSOs include, but are not limited to, the following: high levels of I&I during wet weather; blockages; structural, mechanical, or electrical failures; collaps ed or broken sewer pipes; insufficient conveyance capacity; and vandalism. Effectiv e and continuous management, operation, and maintenance, as well as ensuring adequate capacity and rehabilitation when necessary are critical to maintaining collection system capacity and performance while extending the life of the system.

. Not Applicable ; This facility is not required to develop or implement a program for maintenance and repair of the collection system; however, i t is a violation of Missouri State Environmental Laws and Regulations to allow untreated wastewater to discharge to waters of the stat e.

S CHEDULE OF C OMPLIANCE (SOC): A schedule of remedial measures included in a permit, including an enforceable sequence of interim requirements (actions, opera tions, or milestone events) leading to compliance with the Missouri Cl ean Water Law, its implementing regulations, and/or the terms an d conditions of an operating permit.Not Applicable ; This permit does not contain a SOC.

S TORM W ATER P OLLUTION P REVENTION P LAN (SWPPP): A plan to schedule activities, prohibitions of practices, maintenance procedures, and other management practices to prevent or reduce the pollution of waters of the state. The plan may include, but is not limited to, treatment requirements, operating procedure s, and practices to control facility site runoff, spillage or leaks, slu dge or waste disposal, or drainage from raw material storage.

Applicable ; A SWPPP shall be developed and implemented for storm water outf alls and shall incorporate requi red practices identified by the department with jurisdiction, incorporate erosion control practices specific to site conditions, and provide for maintenance an d adherence to the plan.

. V ARIANCE : As per the Missouri Clean Water Law § 644.061.4, variances shall be granted for such period of time and under such terms and conditions as shall be specified by the commission in its order. The variance may be extended by affirmative action of the

commission. In no event shall the variance be granted for a period of time greater th an is reasonably necessary for complying with the Missouri Clean Water Law §§644.006 to 644.141 or any standard, rule or regulation promulgated pursuant to Missouri Clean Water Law §§644.006 to 644.141.

Not Applicable ; This operating permit is not drafted under premises of a petition for variance.

W ASTELOAD A LLOCATIONS (WLA) FOR L IMITS : As per [10 CSR 20-2.010(78)], the amount of pollutant each discharger is allowed by the department to release into a given stre am after the department has determined to total amount of pollutant that may be discharged into that stream without endangering it s water quality.

Not Applicable ; Wasteload allocations were not calculated.

WLA M ODELING :

Not Applicable ; A WLA study was either not submitted or determined not applicable by department staff.

W HOLE E FFLUENT T OXICITY (W ET ) T EST : A WET test is a quantifiable method of determining if a discharg e from a facility may be causing toxicity to aquatic life by it self, in combination with or through syne rgistic responses when mixed with receiving stream water.

Applicable ; In accordance with the Clean Water Act (CWA ) §101(a)(3), requiring WET testing is r easonably appropriate for site-specific Miss ouri State Operating Permits for discharges to waters of the state issued under the National Pollutant Discharge Elimination System. Furthermore, WET testing is a means by which the department determines that [10 CSR 20-7.031(3)(D, F, & G)] are being met by th e permitted facility. In addition to justification for the WET tes ting, WET tests are required under [10 CSR 20-6.010(8)(A)4] to be performed by specialist who are properly trained in conducting the test according to the methods prescribed by the Federal

Government as referenced in [40 CFR Part 136]. WET test will be required by all facilities meeting the following criteria: Facility is a designated Major.

Facility continuously or routinely exceeds its design flow. Facility (industrial) that alters its production process throughout the year. Facility handles large quantities of toxic substances , or substances that are toxic in large amounts. Facility has Water Quality-based Effluent Limitations for toxic substances (other than NH 3 ) Facility is a municipality or domestic discharger with a Design Flow ≥ 22,500 gpd. Other – please justify.

. 303(d) L IST & T OTAL M AXIMUM D AILY L OAD (TMDL):Section 303(d) of the federal Clean Water Act requires that each state identify waters that are not meeting water quality stand ards and for which adequate water pollution controls have not been require d. Water quality standards protect such beneficial uses of wa ter as whole body contact (such as swimming), maintaining fish and other aquatic life, and providing drinking water for people, livest ock and wildlife. The 303(d) list helps state an d federal agencies keep track of waters that are impaired but not addressed by nor mal water pollution control programs.

A TMDL is a calculation of the maximum amount of a given pollutant that a body of water can abso rb before its water quality is affected. If a water body is determined to be impaired as lis ted on the 303(d) list, then a watershed management plan will be developed that shall include the TMDL calculation

Applicable ; Missouri River is listed on the 2003 Missouri 303(d) List for PCBs and Chlordane.

– This facility is not considered to be a source of the above listed pollutant(s) or considered to contribute to the impairment of the

Missouri river.

Part V – Effluent Limits Determination

Outfall #001 – Radwaste Treatment System - SIC #4911 (Piped to Missouri River)

Daily average flow is 0.027 MGD. Daily maximum flow is 0.298 MGD Legal Description: NE 1⁄4, NE 1⁄4, Sec. 14, T46N, R8W, Callaway Latitude/Longitude: +3845424/-09146462 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-28004)

#001 E FFLUENT L IMITATIONS T ABLE :

PARAMETER U NIT B ASIS

FOR

L IMIT D AILY

M AXI MUM W EEKLY
A VER AGE M ON THLY
A VER AGE M OD

IFIED PREVIOUS

PERMIT

LIMITATIONS

F LOW GPD 1 * * NO SAME

BOD 5 MG /L 1 * * NO SAME

TSS MG /L 1 45 30 SAME

P H SU 1 6-9 6-9 NO SAME

C HLORINE

, T OTAL

R ESIDUAL MG /L 3 0.2 0.104 YES 190/* UG /L

O IL & G REASE ( MG /L) MG /L 1 20 15 NO SAME

B ORON

, T OTAL

R ECOVERABLE MG/L 3 * * NO SAME

M ONITORING F REQUENCY Please see Minimum Sampling and Reporting Frequency Requirements in the

Deri vation and Discussion Section below.
* - Monitoring requirement only

** -reserved *** - Parameter not previously established in previous state operating permit. N/A – Not applicable

Basis for Limitations Codes:

1. State or Federal Regulation/Law 7. Antidegradation Policy

2. Water Quality Standard (includes RPA) 8. Water Quality Model

3. Water Quality Based Effluent Limits 9. Best Professional Judgment

4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL

5. Ammonia Policy 11. WET Test Policy

6. Dissolved Oxygen Policy

O UTFALL #001

– D ERIVATION AND D ISCUSSION OF L IMITS : Flow . In accordance with [40 CFR Part 122.44( i)(1)(ii)] the volume of effluent discharg ed from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibil ity of the permittee to inform the department, which may require the submittal of an operating permit modification.

 Boron, total recoverable. Monitoring only retained from previous permit, and is deemed to be protective.

 Biochemical Oxygen Demand (BOD 5 )

. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Total Suspended Solids (TSS)

. Limit from 40 CFR 423 .13. Effluent limitations have been retained from previous state operating permit and is deemed to be protective.

 pH . Limit from 40 CFR 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective,

 Total Residual Chlorine (TRC) . 40 CFR 423 also governs this analyte in addition to the calculated limits below.

Limits have been calculated for the discharge of TRC: Warm-wat er Protection of Aquatic Life CCC = 10 ug/L, CMC = 19 ug/L [10 CSR 20-7.031, Table A]. Background TRC = 0.0 ug/L.

Chronic WLA: C

e = 10 ((0.462 + 15,250)) / 0.462

C

e =330,097 ug/L

Acute WLA: C

e = 19 ((0.462 +4.62)/ 0.462, used 4.62 due to not over 10 times design flow rule

C

e = 209 ug/L

LTA

c = 330,097 ug/L (0.527) = 17 3,961 ug/L [CV = 0.6, 99 th Percentile]

LTA

a = 209 ug/L (0.321) = 67.08 ug/L [CV = 0.6, 99 th Percentile]

MDL = 67.08 ug/L (3.11) =208.64 ug/L [CV = 0.6, 99 th Percentile] AML = 67.08 ug/L (1.55) = 103.97 ug/L [CV = 0.6, 95 th Percentile, n = 4]

Total Residual Chlorine effluent limits of 0.209 mg/L daily maximum, 0.104 mg/L monthly average are recommended if chlorine is used as a disinfectant. Since limits at 40 CFR 423 are set below 0.209 mg/l, that limit of 0.2 mg/l will be used for daily.

 Oil & Grease . Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Temperature. Monitoring Only

 Minimum Sampling and Reporting Frequency Requirements . Sampling and reporting frequency requirements have been retained from previous state operating permit.

 Outfall #001 WET Tests . WET Testing schedules and intervals are established in accordance with the department’s Permit Manual; Section 5.2 Effluent Limits / WET Testing for Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow.

Acute

No less than O NCE /5 YEARS : based on the fact that this is an intermittent discharge.

Allowable Effluent Concentration % for Acute WET test = (Design flow in CFS of outfall #001 / ((7Q10 x 0.25 x 0.1) + (design flow in cfs of outfalls #001))

(0.447 cfs) / ((15,250 cfs x 0.25 x 0.1) + 0.447 cfs =0.001171 = 0.0 117= 10% by default, unless diffuser is put in place.

Outfall #002 - Cooling Tower Blowdown: (Piped to Missouri River)Daily average flow is 4.84 MGD. Daily maximum flow is 14.4 MGD. This outfall consists of water from the Circulating Water System , the Service Water System, and the Essential Service Water (ES W) System. Blowdown from the cooling tower is necessary to maintain the dissolved solids concentration in the recirculating water system within acceptable operatin g limits. The ESW System is not routinely us ed, however water from the ESW System does mix with the other systems as it is periodically run to demonstrat e operability. Additionally, the ESW System can be used to maint ain proper freeboard in the ultimate heat sink pond (see Outfall #017 description) by transferring water to the Service Water Syste m. Legal Description: NW 1⁄4, NW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845459/-09146388 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-28004)

#002 E FFLUENT L IMITATIONS T ABLE :

PARAMETER U NIT B ASIS

FOR

L IMIT

S D AILY

M AXI MUM W EEKLY
A VER AGE M ON THLY
A VER AGE M ODI

FIED PREVIOUS

PERMIT

LIMITATIONS

F LOW GPD 1 * * NO SAME

T OTAL SUSPENDED SOLIDS MG /L 1 * * NO SAME

T OTAL DISSOLVED SOLIDS MG /L 1 * * NO SAME

P H SU 1 6-9 6-9 NO SAME

O IL & G REASE ( MG /L) MG /L 9 20 15 NO SAME

S ULFATE Mg/L 3 * * NO SAME

TOTAL RESIDUAL

CHLORINE mg/L 3 0.2 0.104 YES 190/* MG /L

M ONITORING F REQUENCY Please see Minimum Sampling and Reporting Frequency Requirements in the

Deri vation and Discussion Section below.

* - Monitoring requirement only

** - reserved. *** - Parameter not previously established in previous state operating permit. N/A – Not applicable

Basis for Limitations Codes: 1. State or Federal Regulation/Law 7. Antidegradation Policy 2. Water Quality Standard (includes RPA) 8. Water Quality Model 3. Water Quality Based Effluent Limits 9. Best Professional Judgment 4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL 5. Ammonia Policy 11. WET Test Policy 6. Dissolved Oxygen Policy

O UTFALL #002

– D ERIVATION AND D ISCUSSION OF L IMITS :

 Flow . In accordance with [40 CFR Part 122.44( i)(1)(ii)] the volume of effluent discharg ed from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibil ity of the permittee to inform the department, which may require the submittal of an operating permit modification.

 Total Dissolved Solids. Limit from 423.13. Monitoring retained from previous permit, and is deemed to be protective.

 Total Suspended Solids (TSS)

. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 pH . Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Oil & Grease . 40 CFR 423.13 Temperature. Monitoring Only

 Total Residual Chlorine (TRC)

.

Limits have been calculated for the discharge of TRC: Warm-water Protection of Aquatic Life CCC = 10 ug/L, CMC = 19 ug/L [10 CSR 20-7.031, Table A]. Background TRC = 0.0 ug/L.

Chronic WLA: C

e = 10 ((22.32 + 15,250)) /22.32

C

e = 6842.44 ug/L

Acute WLA: C

e = 19 ((22.32 +223.20)/ 22.32, used 22.32 due to not over 10 times design flow rule

C

e =209. ug/L

LTA

c = 6842 ug/L (0.527) = 3,605 ug/L [CV = 0.6, 99 th Percentile]

LTA

a = 209 ug/L (0.321) = 67.08 ug/L [CV = 0.6, 99 th Percentile]

MDL = 67.08 ug/L (3.11) =208.64 ug/L [CV = 0.6, 99 th Percentile] AML = 67.08 ug/L (1.55) = 103.97 ug/L [CV = 0.6, 95 th Percentile, n = 4]

Total Residual Chlorine effluent limits of 0.208 mg/L daily maximum, 0.104 mg/L monthly average are recommended if chlorine is used as a disinfectant. Since limits at 40 CFR 423 are set below 0.209 mg/l, that limit of 0.2 mg/l will be used for daily.

Outfall #002 WET Tests . WET Testing schedules and intervals are established in accordance with the department’s Permit Manual; Section 5.2 Effluent Limits / WET Testing for Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow.

Chronic

No less than O NCE /P ERMIT C YCLE : Facility is designated as a Major facility or has a design flow ≥ 1.0 MGD. Facility has Water Quality-based effluent limitations for toxic substances (other than NH 3 ).

Acute

No less than O NCE / YEAR : Facility is designated as a Major facility or has a design flow ≥ 1.0 MGD. Facility continuously or routinely exceeds their design flow. Facility exceeds its design population equivalent (PE) for BOD 5 whether or not its design flow is being exceeded. Facility has Water Quality-based effluent limitations for toxic substances (other than NH 3 ).

Allowable Effluent Concentration % for Acute WET test = (Design flow in CFS of outfall #002) / ((7Q10 x 0.25 x 0.1) + (design flow in cfs of outfalls # 002))

(22.32 cfs) / ((15,250 cfs x 0.25 x 0.1) + 22.32 cfs = 0.055 = 5.5%= 10% by default unless diffu ser is put in place.

Critical Chronic Dilution (CCD) % for Chronic WET test = Design flow in CFS of outfalls #001, 002, 003, and 016 / ((7Q10 x 0.25) + (design flow of #001, 002, 003 and 016)

= 22.32 cfs / ((15,250cfs x 0.25) + (22.32 cfs) = 0.00573 = 0.573% = 10 % by default

 Minimum Sampling and Reporting Frequency Requirements . Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #003 - Water Treatment Plant Wa stes (Piped to Missouri River)Daily average flow is 0.0 MGD. Daily maximum flow is 1.645 MGD. (These flows represent wastewater discharged to the settling basi n, actual discharge will vary depending on recycle.) Outfall #003 consists supernatant from a wastewater treat ment lagoon that treats wastewater to remo ve solids. The wastewater that is treate d in the lagoon is mainly from the blowdown of accumulated river solids in the water treatment plant clarif iers. The sand and carbon fi lter backwash, oil water separator and demineralizer system wastewater is also routed to th is treatment lagoon. The oil water separ ator flow consists of wastewater from some plant sumps as well as flow from an oil recovery well that is being used to remediate a h istoric on-site release. Outfall #003 is normally recycled by routing it back to the head of the water treatment plant. Legal Description: SW 1⁄4, SW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845065/-09146409 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-28004)

#003 E FFLUENT L IMITATIONS T ABLE :

PARAMETER U NIT B ASIS

FOR

L IMIT

S D AILY

M AXI MUM W EEKLY
A VER AGE M ON THLY
A VER AGE M ODI

FIED PREVIOUS

PERMIT

LIMITATIONS

F LOW GPD 1 * * NO SAME

T OTAL SUSPENDED SOLIDS MG /L 1 100 30 NO SAME

P H SU 1 6-9 6-9 NO SAME

O IL & G REASE ( MG /L) MG /L 1 20 15 NO SAME

TOTAL RESIDUAL

CHLORINE MG/L 1 0.2 0.104 YES 190/* UG /L

M ONITORING F REQUENCY Please see Minimum Sampling and Reporting Frequency Requirements in the

Deri vation and Discussion Section below.

* - Monitoring requirement only

** - # of c olonies/100mL; the Monthly Averag e for Fecal Coliform is a geometric mean. *** - Parameter not previously established in previous state operating permit. N/A – Not applicable

Basis for Limitations Codes: 1. State or Federal Regulation/Law 7. Antidegradation Policy 2. Water Quality Standard (includes RPA) 8. Water Quality Model 3 Water Quality Based Effluent Limits 9. Best Professional Judgment 4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL 5. Ammonia Policy 11. WET Test Policy 6. Dissolved Oxygen Policy

O UTFALL #003

– D ERIVATION AND D ISCUSSION OF L IMITS :

 Flow . In accordance with [40 CFR Part 122.44( i)(1)(ii)] the volume of effluent discharg ed from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibil ity of the permittee to inform the department, which may require the submittal of an operating permit modification.

 Total Suspended Solids (TSS)

. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 pH . Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Total Residual Chlorine (TRC) . See calculations at outfall #002 , above.

 Oil & Grease . Limit from 40 CFR 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective. Outfall #003 WET Tests . Since this flow is recycled back to tr eatment headworks, no WET test is required.

 Minimum Sampling and Reporting Frequency Requirements . Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #007 – 3 Cell Flow Through Lagoon (Piped to Missouri River)

Daily average flow is 0.0 MGD.

Maximum flow is 0.040 MGD. Design Population Equivalent is 400. This outfall consists of a 3-cell lagoon designed to receive only sanitary and on-site cafeteria waste from the plant. Sludge will be stored in the lagoon. The effluent will then be discharged to a constructed wetland. Outfall #007 is normally recycled by rou ting it to the water treatment plant headworks. Legal Description: SW 1⁄4, SW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3845123/-09146318 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-28004)

#007 E FFLUENT L IMITATIONS T ABLE :

PARAMETER U NIT B ASIS

FOR

L IMIT

S D AILY

M AXI MUM W EEKLY
A VER AGE M ON THLY
A VER AGE M ODI FIED PREVIOUS

PERMIT

LIMITATIONS

F LOW GPD 1 * * NO SAME

T OTAL SUSPENDED SOLIDS MG /L 1 110 70 NO SAME

B IOLOGICAL O XYGEN

D EMAND 5 MG /L 1 65 45 NO SAME

P H SU 1 6-9 6-9 NO SAME

O IL & G REASE ( MG /L) MG /L 9 15 10 YES 20/15

FECAL C OLIFORM #/100m

L 4 * * YES ***

A MMONIA AS N Mg/L 11 * * YES ***

M ONITORING F REQUENCY Please see Minimum Sampling and Reporting Frequency Requirements in the

Deri vation and Discussion Section below.

* - Monitoring requirement only

** - # of c olonies/100mL; the Monthly Averag e for Fecal Coliform is a geometric mean. *** - Parameter not previously established in previous state operating permit. N/A – Not applicable

Basis for Limitations Codes: 1. State or Federal Regulation/Law 7. Antidegradation Policy 2. Water Quality Standard (includes RPA) 8. Water Quality Model 3. Water Quality Based Effluent Limits 9. Best Professional Judgment 4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL 5. Ammonia Policy 11. WET Test Policy 6. Dissolved Oxygen Policy

O UTFALL #007

– D ERIVATION AND D ISCUSSION OF L IMITS :

 Flow . In accordance with [40 CFR Part 122.44( i)(1)(ii)] the volume of effluent discharg ed from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibil ity of the permittee to inform the department, which may require the submittal of an operating permit modification.

 Biochemical Oxygen Demand (BOD 5 )

. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective. Total Suspended Solids (TSS)

. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 pH . Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Fecal Coliform. Monitoring only added.

 Oil & Grease . Conventional pollutant, effluent limitation for protection of aquatic life; 10 mg/L monthly average, 15 mg/L daily

maximum.

Outfall #007 WET Tests . Since this flow is recycled back to tr eatment headworks, no WET test is required.

 Minimum Sampling and Reporting Frequency Requirements . Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfall #009 - Intake Heater Blowdown: (Located on Missouri River)

Daily average flow 0 MGD. Daily maximum flow is 0.006 MGD.

The river intake structure contains two r ecirculating electric heaters which are used to prevent ice formation on the intake ba r screens during the winter months. Outfall #009 consists of discharges from the infrequent blowdown or drainage of these boilers. Legal Description: NW 1⁄4, NW 1⁄4, Sec. 5, T45N, R7W, Callaway Latitude/Longitude: +3842127/-09146185 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri River (P) (00701) USGS Basin & Sub-watershed No.: (10300102-28004)

#009 E FFLUENT L IMITATIONS T ABLE :

PARAMETER U NIT B ASIS

FOR

L IMIT

S D AILY

M AXI MUM W EEKLY
A VER AGE M ON THLY
A VER AGE M ODI

FIED PREVIOUS

PERMIT

LIMITATIONS

F LOW GPD 1 * * NO SAME

T OTAL SUSPENDED SOLIDS MG /L 1 100 30 NO 100/30

P H SU 1 6-9 6-9 NO 6-9

O IL & G REASE MG /L 1 20 15 NO SAME

M ONITORING F REQUENCY Please see Minimum Sampling and Reporting Frequency Requirements in the

Deri vation and Discussion Section below.

* - Monitoring requirement only

** - # of c olonies/100mL; the Monthly Averag e for Fecal Coliform is a geometric mean. *** - Parameter not previously established in previous state operating permit. N/A – Not applicable

Basis for Limitations Codes: 1. State or Federal Regulation/Law 7. Antidegradation Policy 2. Water Quality Standard (includes RPA) 8. Water Quality Model 3. Water Quality Based Effluent Limits 9. Best Professional Judgment 4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL 5. Ammonia Policy 11. WET Test Policy 6. Dissolved Oxygen Policy

O UTFALL #009

– D ERIVATION AND D ISCUSSION OF L IMITS : Flow . In accordance with [40 CFR Part 122.44( i)(1)(ii)] the volume of effluent discharg ed from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibil ity of the permittee to inform the department, which may require the submittal of an operating permit modification.

 Total Suspended Solids (TSS)

. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 pH . Limit from 40 CFR 423.13 Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Oil & Grease . Limit from 40 CFR 423.13. Conventional pollutant, effluent limitation for protection of aquatic life; 10 monthly average, 15 mg/L daily maximum.

 Minimum Sampling and Reporting Frequency Requirements . Sampling and reporting frequency requirements have been retained from previous state operating permit.

Outfalls #010, #011, #012, #014, #015 and #017 - Storm Water Runoff

For this permit cycle, Best Management Practices are being implemented. The permittee will develop a Storm Water Pollution Prevention Plan within 3 months of permit issuance and have it available at the site.

Outfall #016 - Cooling Tower Bypass (Piped to Missouri River)

Daily average flow is 3.32 MGD. Maximum daily flow is 14.4 MGD.

This outfall consists of clarified river wate r and wastewater that has been recycled th rough the water treatment plant. It is used to moderate flow through the water treatment plant and to provide carrier water in the discharge line when discharging from Outfal l

#001. Legal Description: NW 1⁄4, NW 1⁄4, Sec. 13, T46N, R8W, Callaway Latitude/Longitude: +3846128/-09147052 Receiving Stream: Missouri River (P) First Classified Stream and ID: Missouri (P) (00701) USGS Basin & Sub-watershed No.: (10300102-28004)

#016 E FFLUENT L IMITATIONS T ABLE :

PARAMETER U NIT B ASIS

FOR

L IMIT

S D AILY

M AXI MUM W EEKLY
A VER AGE M ON THLY
A VER AGE M ODI

FIED PREVIOUS

PERMIT

LIMITATIONS

F LOW GPD 1 * * NO SAME

T OTAL SUSPENDED SOLIDS MG /L 1 100 30 NO 100/30

P H SU 1 6-9 6-9 NO 6-9

O IL & G REASE MG /L 1 20 15 NO SAME

T OTAL R ESIDUAL
C HLORINE Mg/L 1 0.2 0.104 YES 190/* MG /L

M ONITORING F REQUENCY Please see Minimum Sampling and Reporting Frequency Requirements in the

Deri vation and Discussion Section below.

* - Monitoring requirement only

** - # of c olonies/100mL; the Monthly Averag e for Fecal Coliform is a geometric mean. *** - Parameter not previously established in previous state operating permit. N/A – Not applicable

Basis for Limitations Codes:

1. State or Federal Regulation/Law 7. Antidegradation Policy 2. Water Quality Standard (includes RPA) 8. Water Quality Model 3. Water Quality Based Effluent Limits 9. Best Professional Judgment 4. Lagoon Policy 10. TMDL or Permit in lieu of TMDL5. Ammonia Policy 11. WET Test Policy 6. Dissolved Oxygen Policy

O UTFALL #016

– D ERIVATION AND D ISCUSSION OF L IMITS :

 Flow . In accordance with [40 CFR Part 122.44( i)(1)(ii)] the volume of effluent discharg ed from each outfall is needed to assure compliance with permitted effluent limitations. If the permittee is unable to obtain effluent flow, then it is the responsibil ity of the permittee to inform the department, which may require the submittal of an operating permit modification.

 Total Suspended Solids (TSS)

. Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Total Residual Chlorine (TRC) . See calculations at outfall #002, above.

 pH . Limit from 423.13. Effluent limitations have been retained from previous state operating permit, and is deemed to be protective.

 Oil & Grease . Limit from 423.13. Conventional pollutant, effluent limitation for protection of aquatic life; 10 mg/L monthly average, 15 mg/L daily maximum.

 Temperature. Monitoring Only

 Outfall #016 WET Tests . WET Testing schedules and intervals are established in accordance with the department’s Permit Manual; Section 5.2 Effluent Limits / WET Testing for Compliance Bio-monitoring. It is recommended that WET testing be conducted during the period of lowest stream flow.

Acute

No less than O NCE / YEAR : Facility is designated as a Major facility or has a design flow ≥ 1.0 MGD. Facility continuously or routinely exceeds their design flow. Facility exceeds its design population equivalent (PE) for BOD 5 whether or not its design flow is being exceeded. Facility has Water Quality-based effluent limitations for toxic substances (other than NH 3 ).

Allowable Effluent Concentration % for Acute WET test = (Design flow in CFS of outfall #016) / ((7Q10 x 0.25 x 0.1) + (design flow in cfs of outfalls # 002))

(22.32 cfs) / ((15,250 cfs x 0.25 x 0.1) + 22.32 cfs =0. 055 = 5.5%= 10% by default un less diffuser is put in place.

 Minimum Sampling and Reporting Frequency Requirements . Sampling and reporting frequency requirements have been retained from previous state operating permit, and is deemed to be protective.

Part VI – Administrative Requirements

On the basis of preliminary staff review and the application of applicable standards and regulations, the Department, as admini strative agent for the Missouri Clean Water Commission, proposes to issue a permit(s) subject to certain effluent limitations, schedules , and special conditions contained herein and within the operating permit. The proposed determinations are tentative pending public

comment.

P UBLIC N OTICE : As per the Missouri Clean Water Law, the Missouri Clean Water Co mmission, and the federal Clean Water Act, persons wishing to comment on Missouri State Operating Permits ar e directed to do so by a department approved Public Notice coversheet. This Publ ic

Notice coversheet is attached to a Missouri Stat e Operating Permit during the Public Notice period.

- The Public Notice period for this operating permit was from October 3, 2008 to November 3, 2008. Responses to the Public Notice of this operating permit warranted the modification of the terms and conditions of this permit. Outfall #018 was elimin ated andthe analytes and WET testing in that outfall (which was an artif icial composite of other outfalls) distributed to outfalls #001 , #002, and

#016.

D ATE OF F ACT S HEET : A UGUST 13, 2008

C OMPLETED B Y :

T IM S TALLMAN , E NVIRONMENTAL S PECIALIST
W ATER P ROTECTION P ROGRAM
P ERMITTING AND E NGINEERING S ECTION
NPDES AND S TORM W ATER P ERMITS U NITPart VII – Appendices

A PPENDIX #

- C LASSIFICATION W ORKSHEET :

I TEM P OINTS P OSSIBLE P OINTS
A SSIGNED Maximum Population Equivalent (P.E.) served (Max 10 pts.) 1 pt./10,000 PE or major

fraction thereof. 0

Maximum: 10 pt Design Flow (avg. day) or peak month; use greater (Max 10 pts.) 1 pt. / MGD or major

fraction thereof. 0

EFFLUENT DISCHARGE RECEIVING WATER SENSITIVITY:

Missouri or Mississippi River 0 0

All other stream discharges except to losing streams and stream reaches suppor ting whole body contact 1 0

Discharge to lake or reservoir outside of designated whole body contact recreational area 2 0

Discharge to losing stream, or stream, lake or reservoir area supporting whole bo dy contact recreation 3 0

PRELIMINARY TREATMENT - Headworks

Screening and/or comminution 3 0

Grit removal 3 0

Plant pumping of main flow (lift station at the headworks) 3 0

PRIMARY TREATMENT

Primary clarifiers 5 0

Combined sedimentation/digestion 5 0

Chemical addition (except chlorine, enzymes) 4 0

REQUIRED LABORATORY CONTROL – performed by plant personnel (highest level only)

Lab work conducted ou tside of plant 0 1

Push – button or visual methods for simple test such as pH, Settleable solids 3 0

Additional procedures such as DO, COD, BOD, titrations, solids, volatile content 5 0

More advanced determinations such as BOD seeding procedures, fecal coliform, nutrients, total oils, phenols, etc. 7 0

Highly sophisticated instrumentation, such as atomic absorption and gas chromatograph 10 0

ALTERNATIVE FATE OF EFFLUENT

Direct reuse or recy cle of effluent 6 0

Land Disposal – low rate 3 0

High rate 5 0

Overland flow 4 0

Total from page ONE (1)

---- 1A PPENDIX #

- C LASSIFICATION W ORKSHEET ( CONTINUED ):

I TEM P OINTS P OSSIBLE P OINTS
A SSIGNED VARIATION IN RAW WASTE (highest level only) (DMR exceedances and Design Flow exceedances) Variation do not exceed those normally or typically expected 0 0

Recurring deviations or excessive variations of 100 to 200 % in strength and/or flow 2 0

Recurring deviations or excessive variations of more than 200 % in strength and/or flow 4 0

Raw wastes subject to toxic waste discharge 6 0

SECONDARY TREATMENT

Trickling filter and other fixed film media with secondary clarifiers 10 0

Activated sludge with second ary clarifiers (including

extended aeration and oxidation ditches) 15 0

Stabilization ponds without aeration 5 0

Aerated lagoon 8 0

Advanced Waste Treatment Polishing Pond 2 0

Chemical/physical – without secondary 15 0

Chemical/physical – following secondary 10 0

Biological or chemical/biological 12 0

Carbon regeneration 4 0

DISINFECTION

Chlorination or comparable 5 0

Dechlorination 2 0

On-site generation of disinfectant (except UV light) 5 0

UV light 4 0

SOLIDS HANDLING - SLUDGE

Solids Handling Thickening 5

Anaerobic digestion 10 0

Aerobic digestion 6 0

Evaporative sludge drying 2 0

Mechanical dewatering 8 0

Solids reduction (incineration, wet oxidation) 12 0

Land application 6 0

Total from page TWO (2)

---- Total from page ONE (1)

---

Grand Total

--- 1

- A: 71 points and greater - B: 51 points – 70 points - C: 26 points – 50 points - D: 0 points – 25 points